Rock Worm Caddis

The Rock Worm Caddis pattern has roots tracing back to its first tying in 1925. Its defining features include a plump, segmented body complemented by a contrasting thorax. The common name, green sedge or green rock worm aptly captures the overall appearance of this caddisfly. These larvae exhibit a range of green shades, with bright green bodies that distinctly stand out against a brown or gray stream bottom. Referred to as "free-living" caddis, they forego the typical protective case, leaving them vulnerable to feeding trout if swept off the bottom into the water column.

Fish the Rock Worm Caddis on a dead drift along the riverbed, where caddis larvae naturally reside. Use it as the anchor fly in a nymph rig to get it into the strike zone quickly. For added effectiveness, try subtle twitches or let the fly swing at the end of the drift to mimic the larva's movement. Match the color to local conditions, such as green, tan, or brown.